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02-02-2020, 05:47 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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I was all set for a 360 since I lived at 8500', but an O-320 D2A appeared for a price I couldnt refuse. I am just getting ready to fly and Im ok with the 320, but would go with 360 if I were to do it again.
Reasons:
Pros - my kids live in the Rock Mountain area. We travel there quite often so the added hp would be nice.
Cons - none I could think of. Maybe a bit more weight in the nose but that can be worked with pretty easy. Some say it can overspeed in level flight. A 9 with a 290 in it can overspeed at a slight dive. Dont do that with either engine and problem solved.
Unless you can get a screaming deal on a 320 like I did, go for the hp.
__________________
rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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02-02-2020, 05:54 PM
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Join Date: Mar 2008
Location: Reno NV
Posts: 542
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Dreaming of what engine for my RV9A
Stop dreaming and put in an IO-360, fixed pitch Sensenich 72 x 85. It wil cruise at 155 kts, 8.5gal/hr at 10.5 alt. LOP at same altitude 7.2 at 143 kts and no wind, Mr. Dynon will says 27.2 kts/gal. Less than 10 kts of wind, that's how I lean, 27 kts/gal plus or minus. Dan from Reno
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02-02-2020, 06:39 PM
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Join Date: Aug 2011
Location: Jeffersonville, IN
Posts: 393
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Have the titan IO-340 myself with catto 3 blade and very happy.
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Jeff Scott
RV9A First Flight 9/30/19
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02-02-2020, 07:53 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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We're 13yrs in, and I will be looking for more horsepower for the -9 when the time comes to do something with the engine. Mostly for the anemic nature of the 320 at 14-16k' where the wing is very happy.
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Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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02-02-2020, 09:07 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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IO360 in mine since the beginning. My fuel burn is the same or perhaps a bit less (believe it or not) than similar RVs with 320s. Possibly because of the injection vs. carb plus I lean aggressively. Flying (near gross) in the mid-teens at ~165-170 mph, I burn around 7-7.2 gph. Catto 3-blade prop, pitched for cruise. Easy to throttle back if necessary (at lower altitude). Weight penalty for going 360 vs 320 was about a dozen pounds. Only reason to go with a 320 would be a really (!) good deal on an engine, in my opinion.
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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02-03-2020, 05:43 AM
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Join Date: Oct 2010
Location: Berlin, Germany
Posts: 46
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.... our RV9a flies great behind a O320 D1A with dual emag ignitions, needs 28L /h. 160 hp are plenty ... but I would love to fly a smooth balanced engine, I guess a IO320 would be nice ...
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Pit
flying RV9a 
a father & son project
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02-03-2020, 07:13 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quote:
Originally Posted by Finley Atherton
A 360 and a Whirl Wind composite constant speed prop.
Fin 9A
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Bingo. IO-360 and WW200RV prop makes the airplane come alive.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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02-03-2020, 07:34 AM
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Join Date: Dec 2007
Location: Aubrey, TX
Posts: 358
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Quote:
Originally Posted by airguy
Bingo. IO-360 and WW200RV prop makes the airplane come alive.
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I would agree with Finley Atherton and Greg Niehues above ?IO-360 and a Whirlwind WW200RV?. Take off like you are leaving an aircraft carrier and smooth to cruse.
BUT never forget, as someone has stated, you can overspeed at level flight. I am what I consider a low time pilot, but I know the limits of the RV-9 and I have a serious respect for those. I limit my speed to 160 MPH indicated at 8500? that is about 180 MPH true. Which put my fuel burn at under 7 GPH. I love the combination.
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Dean Eiland
Aubrey, TX
Former Vice President EAA Chapter 1246
RV-9 (yes) N369RV
Mattituck IO-360, C/S Whirl Wind Prop, GRT, Digiflight II, Garmin SL30 & GTX 330 and Hotel Whisky Aux tanks, Bla Bla Bla
Flying
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02-03-2020, 08:38 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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My -9 started life with an O-290d2 of 140 hp for takeoff and 135 hp continuous.
That is the perfect engine for the -9. Plenty of power and very light. After a prop strike, I replaced it wittan O-360 and a two bladed Catto cruise prop.
I think the only way you could exceed Vne in level flight is if you were flying at 5 feet MSL. AT 8,000' DA it will cruise right at 175 knots TAS, five less than Vne. When you point the nose down, you do have to throttle back. I never fly it that fast as that 360 gets really thirsty at 75% power. My typical cruise is 155 to 160 knots at around 7.2 GPH.
The 320 is an engine for a four place Cessna 172. It is plenty of power for a -9.
I went with the O-360 because at the time there was only $500 difference in price between it and an O-320. I also ordered tappered cylinders, lightweight starter, and dual P-mags. With a Catto prop I'm lighter than an O-320 with a fixed pitched metal prop.
I took a close look at the 340 but decided I would rather have a "common" engine as I was worried about future parts availability.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 02-03-2020 at 08:45 AM.
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02-03-2020, 09:46 AM
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Join Date: Sep 2014
Location: Maple Valley, WA
Posts: 273
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TA200TP when Turbine Aeronautics releases it.
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